Accessory drive for internal combustion engine



Aug. 19, 1958 H. H. HAAS 2,847,986

ACCESSORY DRIVE FOR INTERNAL COMBUSTION ENGINE Filed June 18. 1956 5Sheets-Sheet 1 INVENTOR.

H. H. HAAS Aug. 19, 1958 ACCESSORY DRIVE FOR INTERNAL COMBUSTION ENGINE3 Sheets-Sheet 2 Filed June 18, 1956 INVENTOR. 799 68? 7?, 77245 ATTORNEYS H. HJHAAS Aug. 19, 1958 ACCESSORY Dam-z FOR INTERNAL COMBUSTION,ENGINE Filed June, 18.1956

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ATTORNEYS United States Patent ACCESSORY DRIVE FOR INTERNAL COMBUSTIONENGINE Herbert H. Haas, Royal Oak, Mich., assignor, by mesneassignments, to Continental Motors Corporation, Muskegon, Micln, acorporation of Virginia Application June 18, 1956, Serial No. 591,902

9 Claims. (Cl. 123-495) This invention relates to an accessory drivingmeans for internal combustion engines, and more particularly to acrankshaft driven compact accessory driving means constructed toaccurately synchronize some accessories with the crankshaft whilepermitting relatively flexible synchronization of other accessories.

In internal combustion engines having accessories such as fuel injectionpumps, which must be driven in accurate synchronization with respect tothe crankshaft in order to obtain uniform and precise fuel meteringcharacteristics, and having other accessories such as heavy cooling fansrotating at high speed with inherently large inertia forces, andnecessitating highly flexible synchronization with respect to thecrankshaft, the means for driving both types of accessories should becarefully utilized. In constructing such driving means, certain factorsneed to be taken into consideration, such as compactness of the engineas a whole, simplicity of the driving means construction, accessibilityof parts, and facility of the general engine assembly.

An object of the present invention is to provide an improved means fordriving diverse engine accessories by constructing a compact crankshaftdriven drive means having both stiff and flexibly operated components.

Another object of the present invention is to facilitate generalassembly of engine accessories by providing a compact multiple accessorydrive shaft ,to which the various accessories may be readilyindividually coupled.

A further object of the invention is to simplify the accessory drivingmeans construction by providing a compact multiple accessory drive shafthaving a single connection to the engine crankshaft and adapted forconnection to both stiflf and flexibly operated accessories,

Yet another object of the invention is to provide for more compactengine assembly by constructing an accessory driving means disposedexterior to the engine crankcase and comprising a plurality of shaftsconcentrically rotatable about a common axis.

A still further object of the invention is to provide an engine withfuel injection pumps accurately synchronized to the operation of theengine crankshaft through an intermediate driving means also adapted tooperate high inertia cooling fans by constructing an accessory drivingmeans having a single crankshaft connection and comprising a relativelyrigid shaft for driving the pumps as wellas a relatively flexible shaftfor driving the fans, the shafts being secured together for simultaneousand uniform operation.

For a more complete understanding of my invention, reference may be hadto the accompanying drawings illustrating a preferred embodiment of theinvention in which like characters refer to like parts throughout theseveral views and in which Fig. 1 is an elevational end view, partly cutaway, of a preferred V-type internal combustion engine incorporating thepresent invention.

Fig. 2 is a diagrammatic cross section primarily of ice the accessoryportion of the engine taken substantially on the line 2--2 of Fig. 1.

Fig. 3 is an enlarged fragmentary portion of the accessory driving meansshown in Fig. 2.

Fig. 4 is a fragmentary top view, partly in section, of the accessorydriving means shown in Fig. 2, and

Fig. 5 is a sectional view taken substantially on the line 55 of Fig. 2.

In Fig. l, a flywheel end view of a preferred V-type internal combustionengine is illustrated as having a crankcase 11 provided with asubstantially flat top surface 11a and inclined side surfaces 11b towhich engine cylinders 12 are secured. The flywheel end of thecrankshaft 13, as shown in Fig. 2, is provided with a driving means suchas gear 14.

Various accessories, such as fuel injection pumps 15 and fan assemblies15a, are mounted on the upper surface 11a of the crankcase, and areadapted to be operated by an accessory drive shaft assembly 16, which ispreferably supported by bearing assemblies 17a and 17b secured in anaccessory housing structure 18 which in turn is mounted on the crankcase11. One end of the accessory drive shaft assembly 16 is provided with adriven gear 19 which extends through a slot 20 in the crankcase 11 tomesh with the crankshaft gear 14.

The fuel injection pumps 15 must be driven in precise synchronizationwith the crankshaft 13, but due to the high torque of the cooling fans15a, these latter require more flexibility of drive. The compactaccessory drive shaft assembly 16 is adapted for such diverse operationsas is illustrated in more detail in Fig. 3.

The driven gear 19 is splined as at 25 or otherwise secured to a hollowshaft 26 of stiff or rigid construction which is rotatably supported bybearings 17a. An inner shaft or torsion bar 27 of relatively flexibleconstruction, is preferably splined within the hollow shaft 26 as at 28,and is otherwise supported Where desired by bearings 17b. The hollow'shaft 26 is provided with an accessory drive gear 30 preferably engagedwith a pair of fuel injection pump driven gears 31, which operate thefuel injection pumps 15 preferably through pump shafts 32 and couplers33.

The inner shaft 27 is preferably enclosed in a housing '35 except withinthe accessory housing structure 18 where it is provided with anaccessory drive gear 36 preferably engaged with a fan driven gear 37,which drives the fan 15a through a shaft 38 supported in a tower housingassembly 39.

As may be seen in Figs. 4 and 5, the pump drive shafts 32 are arranged-to extend past either side of the fan drive shaft 38, to provide aconvenient placement of the pumps 15 between the two fan tower housingassemblies 39. The fuel injection pumps 15 are thus disposedconveniently for supplying fuel to fuel injection nozzles 15b throughpipes or conduits 150, as indicated in Fig. 1. The torsion bar 27 mayalso be continued as far as desired beyond the accessories shown tooperate additional equipment.

Although I have described but one embodiment of my invention, it will beapparent to one skilled in the art to which the invention pertains thatvarious changes and modifications may be made therein without departingfrom the spirit of the invention or the scope of the aping asubstantially rigid driving second element for driv-- ing some of saidaccessories, and a relatively flexible driving element operable fordriving other of said accessories and secured to said rigid element indirect driving relation, said second driving element being relativelyflexible with respect to said rigid element.

2. In an internal combustion engine having a plurality of accessorieseach provided with driven means, a crankshaft, and a driving meansoperably connecting said driven means with said crankshaft, said drivingmeans comprising a substantially rigid driving element operable fordriving some of said accessories, and a second driving element operablefor driving other of said accessories and secured to said rigid element,said rigid element in direct driving relation, said second drivingelement being relatively flexible with respect to said rigid elementcomprising a rotatable hollow shaft operably connected at one end tosaid crankshaft, said second driving element comprising a shaft disposedconcentrically within said hollow shaft and connected thereto only atthe crankshaft end thereof.

3. In an internal combustion engine having a plurality of accessorieseach provided with driven means, a crankshaft, and a driving meansoperably connecting said driven means with said crankshaft, said drivingmeans comprising a substantially rigid hollow shaft rotatably supportedby said engine, one end of said shaft operably connected to saidcrankshaft, the other end of said shaft operably connected to some ofsaid accessory driven means and providing substantially accuratesynchronization of said accessories with respect to said crankshaft, anda second rotatable shaft secured to the crankshaft end of said rigidshaft, disposed concentrically within said hollow shaft, both of saidshafts being rotatable together about acommon axis, said second shaftbeing relatively flexible with respect to said rigid shaft and operablyconnected with other of said accessory driven means to providerelatively flexible synchronization thereof with respect to saidcrankshaft.

4. In an internal combustion engine having a plurality of accessorieseach provided with driven means, a crankshaft, and a driving meansoperably connecting said driven means with said crankshaft, said drivingmeans comprising a substantially rigid hollow shaft operable for drivingsome of said accessories, and a second driving shaft operable fordriving other of said accessories and directly secured to said hollowshaft, said rigid hollow shaft being of shorter length than said secondshaft and concentrically disposed with respect thereto in direct drivingrelation, said second driving element being relatively flexible withrespect to said rigid shaft.

5. In an internal combustion engine having a plurality of accessorieseach provided with driven means, a crankshaft, and a driving meansoperably connecting said driven means with said crankshaft, said drivingmeans comprising a substantially rigid hollow tubular shaft rotatablysupported by said engine, one end of said shaft operably connected tosaid crankshaft, the other end of said shaft operably connected to someof said accessory driven means and providing substantially accuratesynchronization of said accessories with respect to said crankshaft, anda second rotatable shaft having one end thereof secured to thecrankshaft end of said first shaft, said second shaft extending throughand projecting from said first shaft and concentrically disposed withrespect thereto, said second shaft being relatively flexible withrespect to said rigid shaft and operably connected with other of saiddriven means with said crankshaft, said driving means comprising asubstantially rigid hollow shaft rotatably supported by said engine, oneend of said shaft operably connected to said crankshaft, the other endof said shaft operably connected to some of said accessory driven meansand providing substantially accurate synchronization of said accessorieswith respect to said crankshaft, and a second rotatable shaft secured tothe crankshaft end of said rigid shaft, both of said shafts beingrotatable together about a common axis, said second shaft beingrelatively flexible with respect to said rigid hollow shaft and operablyconnected with other of said accessory driven means to providerelatively flexible synchronization thereof with respect to saidcrankshaft, the common axis of said shafts being disposed parallel tothe axis of rotation of said crankshaft.

7. In a fuel injection type internal combustion engine having a fuelinjection pump, an engine cooling fan, and a crankshaft, said pump andsaid fan each provided with a driven means, and a driving means operablyconnecting said driven means with said crankshaft, said driving meanscomprising a hollow substantially rigid shaft rotatably supported bysaid engine, one end of said shaft operably connected to saidcrankshaft, the other end of said shaft operably connected to said pumpdriven means and providing substantially accurate synchronization ofsaid pump with respect to said crankshaft, and a second shaftconcentrically disposed in said first shaft and secured only at thecrankshaft end thereof, the other end projecting from the pump operatingend of said first shaft and operably connected to said fan driven means,said second shaft being relatively flexible with respect to said firstshaft to provide relatively flexible synchronization of said fan withrespect to said crankshaft.

8. In an internal combustion engine having a plurality of accessorieseach provided with driven means, a crankshaft, and a driving meansoperably connecting said driven means with said crankshaft, said drivingmeans comprising two driving elements directly secured and operating inunison, one of said elements being relatively flexible with respect tothe other of said elements, said elements respectively drivinglyconnected to separate driven means.

9. 'In an internal combustion engine having a plurality of accessorieseach provided with driven means, a crankshaft, and a driving meansoperably connecting said driven means with said crankshaft, said drivingmeans comprising two driving elements directly secured and operating inunison, one of said elements being relatively flexible with respect tothe other of said elements, said elements respectively drivinglyconnected to separate driven means, said driving elements eachcomprising a driving shaft, one of said shafts being concentricallydisposed with respect to the other of said shafts.

References Cited in the file of this patent UNITED STATES PATENTS1,874,681 Woolson Aug. 30, 1932

